Thermostatic circuit-controller.



THERMOSTATIC CIRCUIT CONTROLLER.

APPLICATION. FILED I'EB.15, 19Q8.

WITNESSES: llwm'ros Jiermazz pcratures.

burners for gas-st0ves,

. 'rnnnmosra'rrcpmcmrooirmonnnns Specification :0! Letters Patent.

1 UNITED s ngagggem oFFIo nnnnan L. areas, or nlxnr'nzs rennin Patented Aug. 11', 1908. Y,

. Application filed February 15, 1903. Serial Re. 416,029. 1 i

To all whom it may concern:

- the following is a s ecification.

My invention re ates to certain new and useful improvements in thermostatic circuit controllers and the like, and it is more particularly adapted for use in connection with gas-jets and lamps, etc.

Primarily, my invention has for its object to provide a very simple and effectively constructedthermostat which can be readily applied to the burner to serve its intended purposes.

In its generic nature-the invention 'embodies a non-fusible base to .:hich an expan sible bridge is secured, the brid e being fastened at its endsand in electricril connection with a air of resilient fingers by means of which t re device is held in place. A relatively fixed contact rnember'is secured to the base to cooperate with a spring contact member interposed between the fixed contact and the bridge whereby the expansion and contraction of the bridge will move the spring contact member out of or into engagement with the fixed contact as the case may be to open or close an electrical circuit which may be used to operate an alarm. A iixcd contact is provided with means whereby it may be end the ad usted to varv the operation of the device so as to contr'o the circuitat definite tem- Vore specifically my invention embodies certain novel details of construction, combination and arrangement of parts, all of which will be first described and then specifically ointed out in the appended claims, reference cin had to the accompanying drawings, in whiclr:

Figure 1 is a central vertical longitudinal section of a burner embodying my invention, the burner being of an incandescent mantle type, and the parts being shown in the position they assume before the burner is lighted. 2, is asimilar view showing the position cfiihe parts 'ust after the burner is lighted and before the bridge member has become suiiicientlyheated to permit the circuit being opened. the position of the parts when the circuit is electric c Fig. 3,-is a similar View showing;

'of which rests in a slot 1 in the base 1 and o ened. Fig. 4, is a detail perspective view 0 my invention per Se. ig. 5, is a view showing lai -w my invention may be adapted foruse in connection with the burner of agas-sto e- 5o Referrkig now to the accompanying drawings in winch like letters and numerals of reference indicate like parts in all of the figures 1 designates a base of slate, stone or other fire-proot materiaLNvhich base forms the 5 support for a bridge member 2, whose ends '2 are apertnred to permit passage of the fastening members 3, which may be either rivets or baits, as'conditions may require, the members 3 passing through the endsdt of resiiient leg 4, by means of which the-device is held piece, as will be hereinafter more fully explained. The fixed contact member compris s a" plate 5 of singular form the upper port-i0 S threaded to receive the adjustable contac screw 6 which is locked by a check nut 6* in I its adjusted position, and is provided with a turn head 6* by means of which the screw can be Earned to adjust the same. The plate 5 oi the fixed contact carries a binding screw 5 on its downwardly projecting por- 4 tron 5 to zrnrch one of the terminals 0 an electric circuit may be connected. as

7 designes the movable contact member which con: s of a spring metal body secured at one end byone of the members 3 and in electrical contact ith the bridge 2. At such Table contact 7 passes over the fixed conzsct 6 and is bent back as at'7-1t0 form a U'snaped end and terminati in an upwardly extending ortion 7? whic-r contacts with rhe underside of the bridge 2 at a. point sheer: midway the endsthereof.

In the sctical application of my invention the .n. e is adapted for arse in connection with ism gas burners of the illuminating type c or'the stove burner type and it has for i rhject to automatically open an I when hot and close such pircuit upon eooiing. .In the drawings I have shown two forms of my invention, one to a gas burns-r of the illuminating type and the other to s. burner for gas stoves.

Referri: V particularly to Figs. 1 to 3 itwill be seen as; rheburner 8 which may be of any app; Ted type has the usual central chamber 5 into which in device is fitted, v v the spring 4 holding t edevice in place 110 ward burner,

and making electrical contact with the me- 'tallic parts ofthe burner. The electric .cir-.-

' 'terminal 9 being connected to the fixed contact plate 5, and includes a battery 9, an

alarm 9 and may include a cut-off -9, as in-' dicated.

Assume the parts to be in the position shown in Fig. 1,

circuit is closed. Upon ignition of the burner thereof the heat thereof will cause the bridge 2 to expand and inasmuch as the ends of the bridge arefixed the same will be jcompelled to buckle in the center. Giving to the contact of the s ring member 7 with the underside of the bridge, the budding will be up or away from the contact members. Thus after the bridge has exnanded a prede-. termincd amount the mov ab e contact '7 will be raised up by its resiliency from the fixed contact screw 6 and open the electric circuit, The ouerator may then close the switch 9 Should by any accident or otherwise the flame be extinguishedfrom the burner, the bridge 2 upon cooling will force the movable contact into engagement with the fixed contact as it assumes its ,normei position, as shown in Fig. 1, and close the electric ClIGlllt,

' thus operating the alarm.

'By virtue of the U-shaped portion of the movable contact member, the bridge 2 will buckle upwardly a predetermined ifmount upon opening the circuit, and conversely in cooling. The bridge'will-first close the circuit for the members 7 and 6 and then as the bridge 2 continues to contract in cooling the U-shaped portion 7 of the movable contact member 7 will give and thus prevent any undue strain being exerted on the bridge thus 4 taking all stress and strains oi? the an led ortions of the bridge and prevent t icir reaking.

In adapting my invention for use in connection with stove burners the legs 4 may be. omitted and the members 3 may be in the nature'of screws or bolts and of such length as to pass through legs 10, bracketmembers be secured to thestcve burner to e device in the heat zone of the it being understooddhat my improved thermostat when adapted for use with gas-stoves may be made larger than when used in connection with gas burners of the illuminating type. a

Further"modifications in the detailed construction, cooperation, design and pur ose of parts may be readily madewithout epartmg from thespiritnfthe mvention or the scope of the a pendcdfclanns, and by providm the fixed contact member with the ad- 10 ina hold til 5 justable contactscrcw 6 the deride may be before the burner is lighted. the movable and fixed contacts will be 1n en- 7 gagement with one another and the electric Beg-16o set to open thecircuit at any predetermined temperature by simply ad'ustmg the screw 6 toward or from the mova le contact.

, (From the fore oing description taken in v connection with the accompanying drawings, 1t 19 thought the complete construction, op-

eration and numerous advantages of my invention' will be readily understood by those skilledin the art to which the invention ap contact mounted on the base between the bridge member and the base and in electrical contact with the bridge member, said movable contact exerting tension against the un-' derside of the bridge member, a relatively.

fixed contact cooperating with said movable contact, means for connecti the movable and fixed contacts to the eectric circuit, said bridge member and said movable contact being arranged so that as the bridge member expands b .heat the movable con tactwi'll disengage ii'om the fixed contact to open an electric circuit and as the brid e member contracts on close the electric circuit.

2. A thermostat comprising a non-fusible insulating base,- a bridge member mounted thereon and secured at the ends, a movable contact mounted on the base between the bridge member and the base and in electrical contact with the bridge membensaid mov-- able contact exerting tension against the underside of the bridge member, a relatively fixed contact cooperating with said movable contact, means for connecting the movable and fixed contacts to the electric circuit, said bridge member and said movable contact being arranged so that as the bridge member expands b heat the movable contact Wlll. disengage om the fixed contact to open an electric circuit and as the bridge member contracts on cooling will a ain close the electr'ic circuit, said relative y f :ced contact member-including a contact plate and an ad justable contact screw.

3. A thermostat comprising a non-fusible insulating base, a bridge member mounted thereon and secured to the ends, a movable contact member mounted on the base bef tween the bridge member and the base and in electrical contact with the bridge member, said movable contact exerting tension against the underside of the bridgemember, a relatively fixed contact cooperating with said movable contact, means for connecting the movable and fixed contacts to the electric circuit, said bridge'mcmber and said mov able contact being arran ed so that as the bridge member expands hy heat the movable contact will disengage from the fixed contact to open anelectric circuit and as the 1 0 cooling will againbridge member contracts on cooling will \f again close the electric circuit, said movable contact comprising a resilient member'secured at one end and provided with a U- shaped portion ternu'natm in an angled end ao engage the underside or the bridge mem- 4. A thermostat comprising a non-fusible insulating base, a bridge member mounted thereon and secured to the ends, a movable contact mounted on the base betw-en the bridgemember and the base and in electrical contact with the bridge member, said movable contact exerting tension against the underside of the bridge member, a relatively fixed contact cooperating with said movable contact, means for connecting the movable and fixed contacts to the electric circuit, said bridge member and said movable contact being arranged so that as' the bridge member expand-ab .heat the movable contact will disengage rom the fixed contact to. open an electric circuit and as the bridge member contracts on cooling will a ain close the electric circuit, said relatively fixed contact member including acontact plate and an adjusting contact screw, said movable contact comprising a resilient member secured at one end and provided with a U-shaped portion terminating in an an led end to engage the underside of the bridge member. v

5. A thermostat com rising a base of insulating"material, a dixed contact plate mounted thereon, an adjustable contact screw in electrical connection therewith, a movable contact member mounted on said base and normally tending to move out of contact with such screw, a bridge member 40 mounted over said movable contact and said screw and normally holding said movable contact in enga ement with said screw, said I bridge memberdaeing expansible by heat to permit the movable contact member to disengage the screw attimes.

6. A thermostat corn; rising a base of insaluting material, a fixed contact plate mounted thereon, an adjustable contact screw in electrical connection therewith, a

movable contact member mounted on said base and normally tending to move out of contact with such screw, a bridgamember mounted over said movable contact and said screw and normally holding such movable contact in enga ement with said screw, said bridge member eing expansible by heat to permit the movable contact member to disengage the screw at times, and resilient feet mounted on the base and in electrical connection with the bridge member.

7. A thermostat corn rising a base of insulating material, a fixed contact plate mounted thereon, .an adjustable contact screw inelectrical connection therewith, a

movable contact member mounted on said base and normally tending to move out of contact with said screw, a bridge member.

mounted over said movable contact and said screw and. normally holding said contact in enga ement with said screw, said brid e member being expansible by heat'to permit the movable member to disengage the screw at times, resilient feet mounted on the base and in electrical connection with the bridge member, said contact plate having means for connecting with the terminal of an elec-,'

t-ric circuit.

Witnesses:

CHARLES G'Kmo, ALVIN W. IIALL.

HERMAN L. RHICKS. 

